nuttx-apps/examples/audio_rttl/audio_rttl.h

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 * apps/examples/audio_rttl/audio_rttl.h
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FAR char *g_song = (FAR char *)
  "Test:d=4,o=6,b=90:c,c#,d,d#,e,f,f#,g,a,a#,b,p,b,a#,a,g,f#,f,e,d#,d,c#,c";